The article shows that fertilizer use in Kenya increased after input market reforms in the 1990s. By studying the effects of these reforms on maize production, researchers found that lower fertilizer prices led to higher maize yields in different regions of the country. However, the impact varied depending on the area and year, with some provinces seeing a 15 to 100 kg/ha increase in maize yields. Despite these improvements, the study found that the response of maize to fertilizer application was limited in high fertilizer-consuming areas, meaning that increased fertilizer use didn't always translate to significant food production gains. Overall, changes in fertilizer prices accounted for 1 to 11 percent of changes in maize production over the survey years.